Candling eggs not only provides information on whether there is an embryo inside; it is also a way to detect abnormalities in the eggshell. Hairline cracks are an obvious example of this, but somewhat less known are the small translucent spots on the eggshell, often referred to as ‘eggshell mottling’. Eggshell mottling occurs in different degrees, from several translucent spots to almost total coverage of the whole eggshell. Read more